YELLOW-BROWN SYNTHETIC DIAMONDS FOUND IN “MIXED” DIAMOND BATCHES
The French Gemmology Laboratory (LFG) has just analysed several thousand yellow-brown diamonds commercially referred to as “cognac” diamonds…
AN EXTRAORDINARY DOUBLET MOUNTED ON A FINE JEWELLERY RING
The LFG recently had the opportunity to study a white gold ring, decorated with an oval green stone…
FIRST SYNTHETIC DIAMONDS BROUGHT TO LFG
Synthetic diamonds have been the subject of numerous studies since they were first created in the 1950s.
AN EXCEPTIONAL PEZZOTTAITE AT THE LFG
Pezzottaite is a relatively new mineral, discovered in 2002 in Madagascar…
AN UNUSUAL FILLED RUBY, LIKELY OILED
A 12.12 ct rectangular red stone with cut edges (Figure 1) was submitted to the LFG.